List of usage examples for org.eclipse.swt.widgets Canvas getDisplay
public Display getDisplay()
Display that is associated with the receiver. From source file:org.eclipse.swt.snippets.Snippet174.java
public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); shell.setText("OpenGL in SWT"); shell.setLayout(new FillLayout()); final Canvas canvas = new Canvas(shell, SWT.NO_BACKGROUND); canvas.addControlListener(new ControlAdapter() { public void controlResized(ControlEvent e) { resize(canvas);/*from w w w .j a v a 2 s.c o m*/ } }); final GLContext context = init(canvas); shell.addDisposeListener(new DisposeListener() { public void widgetDisposed(DisposeEvent e) { context.dispose(); } }); new Runnable() { public void run() { if (canvas.isDisposed()) return; render(); context.swapBuffers(); canvas.getDisplay().timerExec(50, this); } }.run(); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } display.dispose(); }
From source file:widgetTest3.java
/** * Images ** */ public static void doubleBuffering(Composite composite) { // Create canvas final Canvas canvas = new Canvas(composite, SWT.BORDER); // Get white system color Color white = canvas.getDisplay().getSystemColor(SWT.COLOR_WHITE); // Set canvas background to white canvas.setBackground(white);//from w w w. j ava 2 s. c o m // Add paint listener canvas.addPaintListener(new PaintListener() { public void paintControl(PaintEvent e) { // Get Display instance from the event object Display display = e.display; // Get black and red system color - don't dispose these Color black = display.getSystemColor(SWT.COLOR_BLACK); Color red = display.getSystemColor(SWT.COLOR_RED); // Get the graphics context from event object GC gc = e.gc; // Get the widget that caused the event Composite source = (Composite) e.widget; // Get the size of this widgets client area Rectangle rect = source.getClientArea(); // Create buffer for double buffering Image buffer = new Image(display, rect.width, rect.height); // Create graphics context for this buffer GC bufferGC = new GC(buffer); // perform drawing operations bufferGC.setBackground(red); bufferGC.fillRectangle(5, 5, rect.width - 10, rect.height - 10); bufferGC.setForeground(black); bufferGC.drawRectangle(5, 5, rect.width - 10, rect.height - 10); bufferGC.setBackground(source.getBackground()); bufferGC.fillRectangle(10, 10, rect.width - 20, rect.height - 20); // Now draw the buffered image to the target drawable gc.drawImage(buffer, 0, 0); // Dispose of the buffer's graphics context bufferGC.dispose(); // Dispose of the buffer buffer.dispose(); } }); }
From source file:org.eclipse.swt.examples.paint.PaintSurface.java
/** * Constructs a PaintSurface.//from ww w.j ava2s . c o m * <p> * paintCanvas must have SWT.NO_REDRAW_RESIZE and SWT.NO_BACKGROUND styles, * and may have SWT.V_SCROLL and/or SWT.H_SCROLL. * </p> * @param paintCanvas the Canvas object in which to render * @param paintStatus the PaintStatus object to use for providing user feedback * @param fillColor the color to fill the canvas with initially */ public PaintSurface(Canvas paintCanvas, Text statusText, Color fillColor) { this.paintCanvas = paintCanvas; this.statusText = statusText; clearStatus(); /* Set up the drawing surface */ Rectangle displayRect = paintCanvas.getDisplay().getClientArea(); imageWidth = displayRect.width; imageHeight = displayRect.height; image = new Image(paintCanvas.getDisplay(), imageWidth, imageHeight); imageFDC.gc = new GC(image); imageFDC.gc.setBackground(fillColor); imageFDC.gc.fillRectangle(0, 0, imageWidth, imageHeight); displayFDC.gc = new GC(paintCanvas); /* Initialize the session */ setPaintSession(null); /* Add our listeners */ paintCanvas.addDisposeListener(e -> displayFDC.gc.dispose()); paintCanvas.addMouseListener(new MouseAdapter() { @Override public void mouseDown(MouseEvent event) { processMouseEventCoordinates(event); if (paintSession != null) paintSession.mouseDown(event); } @Override public void mouseUp(MouseEvent event) { processMouseEventCoordinates(event); if (paintSession != null) paintSession.mouseUp(event); } @Override public void mouseDoubleClick(MouseEvent event) { processMouseEventCoordinates(event); if (paintSession != null) paintSession.mouseDoubleClick(event); } }); paintCanvas.addMouseMoveListener(event -> { processMouseEventCoordinates(event); if (paintSession != null) paintSession.mouseMove(event); }); paintCanvas.addPaintListener(event -> { if (rubberband.isEmpty()) { // Nothing to merge, so we just refresh event.gc.drawImage(image, displayFDC.xOffset + event.x, displayFDC.yOffset + event.y, event.width, event.height, event.x, event.y, event.width, event.height); } else { /* * Avoid flicker when merging overlayed objects by constructing the image on * a backbuffer first, then blitting it to the screen. */ // Check that the backbuffer is large enough if (paintImage != null) { Rectangle rect1 = paintImage.getBounds(); if ((event.width + event.x > rect1.width) || (event.height + event.y > rect1.height)) { paintFDC.gc.dispose(); paintImage.dispose(); paintImage = null; } } if (paintImage == null) { Display display = getDisplay(); Rectangle rect2 = display.getClientArea(); paintImage = new Image(display, Math.max(rect2.width, event.width + event.x), Math.max(rect2.height, event.height + event.y)); paintFDC.gc = new GC(paintImage); } // Setup clipping and the FDC Region clipRegion = new Region(); event.gc.getClipping(clipRegion); paintFDC.gc.setClipping(clipRegion); clipRegion.dispose(); paintFDC.xOffset = displayFDC.xOffset; paintFDC.yOffset = displayFDC.yOffset; paintFDC.xScale = displayFDC.xScale; paintFDC.yScale = displayFDC.yScale; // Merge the overlayed objects into the image, then blit paintFDC.gc.drawImage(image, displayFDC.xOffset + event.x, displayFDC.yOffset + event.y, event.width, event.height, event.x, event.y, event.width, event.height); rubberband.draw(paintFDC); event.gc.drawImage(paintImage, event.x, event.y, event.width, event.height, event.x, event.y, event.width, event.height); } }); paintCanvas.addControlListener(ControlListener.controlResizedAdapter(e -> handleResize())); /* Set up the paint canvas scroll bars */ ScrollBar horizontal = paintCanvas.getHorizontalBar(); horizontal.setVisible(true); horizontal .addSelectionListener(widgetSelectedAdapter(event -> scrollHorizontally((ScrollBar) event.widget))); ScrollBar vertical = paintCanvas.getVerticalBar(); vertical.setVisible(true); vertical.addSelectionListener(widgetSelectedAdapter(event -> scrollVertically((ScrollBar) event.widget))); handleResize(); }
From source file:PaintExample.java
/** * Constructs a PaintSurface.//from www. java2 s . co m * <p> * paintCanvas must have SWT.NO_REDRAW_RESIZE and SWT.NO_BACKGROUND styles, * and may have SWT.V_SCROLL and/or SWT.H_SCROLL. * </p> * @param paintCanvas the Canvas object in which to render * @param paintStatus the PaintStatus object to use for providing user feedback * @param fillColor the color to fill the canvas with initially */ public PaintSurface(Canvas paintCanvas, Text statusText, Color fillColor) { this.paintCanvas = paintCanvas; this.statusText = statusText; clearStatus(); /* Set up the drawing surface */ Rectangle displayRect = paintCanvas.getDisplay().getClientArea(); imageWidth = displayRect.width; imageHeight = displayRect.height; image = new Image(paintCanvas.getDisplay(), imageWidth, imageHeight); imageFDC.gc = new GC(image); imageFDC.gc.setBackground(fillColor); imageFDC.gc.fillRectangle(0, 0, imageWidth, imageHeight); displayFDC.gc = new GC(paintCanvas); /* Initialize the session */ setPaintSession(null); /* Add our listeners */ paintCanvas.addDisposeListener(new DisposeListener() { public void widgetDisposed(DisposeEvent e) { displayFDC.gc.dispose(); } }); paintCanvas.addMouseListener(new MouseAdapter() { public void mouseDown(MouseEvent event) { processMouseEventCoordinates(event); if (paintSession != null) paintSession.mouseDown(event); } public void mouseUp(MouseEvent event) { processMouseEventCoordinates(event); if (paintSession != null) paintSession.mouseUp(event); } public void mouseDoubleClick(MouseEvent event) { processMouseEventCoordinates(event); if (paintSession != null) paintSession.mouseDoubleClick(event); } }); paintCanvas.addMouseMoveListener(new MouseMoveListener() { public void mouseMove(MouseEvent event) { processMouseEventCoordinates(event); if (paintSession != null) paintSession.mouseMove(event); } }); paintCanvas.addPaintListener(new PaintListener() { public void paintControl(PaintEvent event) { if (rubberband.isEmpty()) { // Nothing to merge, so we just refresh event.gc.drawImage(image, displayFDC.xOffset + event.x, displayFDC.yOffset + event.y, event.width, event.height, event.x, event.y, event.width, event.height); } else { /* * Avoid flicker when merging overlayed objects by constructing the image on * a backbuffer first, then blitting it to the screen. */ // Check that the backbuffer is large enough if (paintImage != null) { Rectangle rect = paintImage.getBounds(); if ((event.width + event.x > rect.width) || (event.height + event.y > rect.height)) { paintFDC.gc.dispose(); paintImage.dispose(); paintImage = null; } } if (paintImage == null) { Display display = getDisplay(); Rectangle rect = display.getClientArea(); paintImage = new Image(display, Math.max(rect.width, event.width + event.x), Math.max(rect.height, event.height + event.y)); paintFDC.gc = new GC(paintImage); } // Setup clipping and the FDC Region clipRegion = new Region(); event.gc.getClipping(clipRegion); paintFDC.gc.setClipping(clipRegion); clipRegion.dispose(); paintFDC.xOffset = displayFDC.xOffset; paintFDC.yOffset = displayFDC.yOffset; paintFDC.xScale = displayFDC.xScale; paintFDC.yScale = displayFDC.yScale; // Merge the overlayed objects into the image, then blit paintFDC.gc.drawImage(image, displayFDC.xOffset + event.x, displayFDC.yOffset + event.y, event.width, event.height, event.x, event.y, event.width, event.height); rubberband.draw(paintFDC); event.gc.drawImage(paintImage, event.x, event.y, event.width, event.height, event.x, event.y, event.width, event.height); } } }); paintCanvas.addControlListener(new ControlAdapter() { public void controlResized(ControlEvent event) { handleResize(); } }); /* Set up the paint canvas scroll bars */ ScrollBar horizontal = paintCanvas.getHorizontalBar(); horizontal.setVisible(true); horizontal.addSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent event) { scrollHorizontally((ScrollBar) event.widget); } }); ScrollBar vertical = paintCanvas.getVerticalBar(); vertical.setVisible(true); vertical.addSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent event) { scrollVertically((ScrollBar) event.widget); } }); handleResize(); }